need replacement part

A quick learner says:
7/8 on top. - also Im replacing the 2830.
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Bob from SWISCO responded:

Hello there. This Top Sash Guide might be our 18-199. Compare the dimensions listed in the pictures on the shop page to confirm.

If you're replacing the channel balances also, I should note that 2830 is just the designation for the spring calibration, not the balance's identity. A lot of different Top Sash Guides can work with a lot of different balances, so the only to know what balances you need is to show us pictures of the nylon fittings or attachments on each end. See the video below.

How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Replace a Top Sash Guide [1080p]
How to Replace a Top Sash Guide [1080p]
VIDEO
WATCH >
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